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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_009_204">&nbsp;</a>NAME</h4><blockquote>
strstr - find a substring
</blockquote><h4><a name = "tag_000_009_205">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="string.h.html">string.h</a>&gt;

char *strstr(const char *<i>s1</i>, const char *<i>s2</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_009_206">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>strstr()</i>
function locates the first occurrence in the string pointed to by
<i>s1</i>
of the sequence of bytes (excluding the terminating
null byte) in the string pointed to by
<i>s2</i>.
</blockquote><h4><a name = "tag_000_009_207">&nbsp;</a>RETURN VALUE</h4><blockquote>
Upon successful completion,
<i>strstr()</i>
returns a pointer to the located string or a null pointer if the string is not
found.
<p>
If
<i>s2</i>
points to a string with zero length, the function returns
<i>s1</i>.
</blockquote><h4><a name = "tag_000_009_208">&nbsp;</a>ERRORS</h4><blockquote>
No errors are defined.
</blockquote><h4><a name = "tag_000_009_209">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_210">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_211">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_212">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="strchr.html">strchr()</a></i>,
<i><a href="string.h.html">&lt;string.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from the ANSI C standard.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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